| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a nonvolatile memory access control system which allows a system originator to freely write information requiring prevention of falsification, while ensuring that falsification of this information is prevented. <P>SOLUTION: A CPU sets a non-rewritable area on a nonvolatile memory 6 according to a system initialization program stored in a boot ROM, and an access control circuit controls rewriting to either permit or inhibit it according to a write flag F set on the non-rewritable area. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
